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Improve documentation for std::{f32,f64}::mul_add #77027

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Dec 11, 2020
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Improve documentation for std::{f32,f64}::mul_add #77027

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72a5cbb
Edit documentation for `std::{f32,f64}::mul_add`.
fu5ha Sep 21, 2020
a6d98d8
generalize warning
fu5ha Oct 13, 2020
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6 changes: 4 additions & 2 deletions library/std/src/f32.rs
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Expand Up @@ -206,8 +206,10 @@ impl f32 {
/// Fused multiply-add. Computes `(self * a) + b` with only one rounding
/// error, yielding a more accurate result than an unfused multiply-add.
///
/// Using `mul_add` can be more performant than an unfused multiply-add if
/// the target architecture has a dedicated `fma` CPU instruction.
/// Using `mul_add` *may* be more performant than an unfused multiply-add if
/// the target architecture has a dedicated `fma` CPU instruction. However,
/// this is not always true, and will be heavily dependant on designing
/// algorithms with specific target hardware in mind.
///
/// # Examples
///
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6 changes: 4 additions & 2 deletions library/std/src/f64.rs
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Expand Up @@ -206,8 +206,10 @@ impl f64 {
/// Fused multiply-add. Computes `(self * a) + b` with only one rounding
/// error, yielding a more accurate result than an unfused multiply-add.
///
/// Using `mul_add` can be more performant than an unfused multiply-add if
/// the target architecture has a dedicated `fma` CPU instruction.
/// Using `mul_add` *may* be more performant than an unfused multiply-add if
/// the target architecture has a dedicated `fma` CPU instruction. However,
/// this is not always true, and will be heavily dependant on designing
/// algorithms with specific target hardware in mind.
///
/// # Examples
///
Expand Down